From 7589758f97f855125f3afff0dc580f13dc643610 Mon Sep 17 00:00:00 2001
From: Chuck McCallum <mccallucc@gmail.com>
Date: Tue, 8 Oct 2024 12:08:28 -0400
Subject: [PATCH] do not parse if no file present

---
 dp_creator_ii/app/dataset_panel.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dp_creator_ii/app/dataset_panel.py b/dp_creator_ii/app/dataset_panel.py
index 04a9acf..57464e3 100644
--- a/dp_creator_ii/app/dataset_panel.py
+++ b/dp_creator_ii/app/dataset_panel.py
@@ -48,7 +48,10 @@ def csv_path():
 
     @reactive.calc
     def csv_fields_calc():
-        return read_field_names(csv_path_calc())
+        path = csv_path_calc()
+        if path is None:
+            return None
+        return read_field_names(path)
 
     @render.text
     def csv_fields():